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TMP175 Fiches technique(PDF) 9 Page - Texas Instruments

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No de pièce TMP175
Description  TMPx75-Q1 Automotive Grade Temperature Sensor With I2C and SMBus Interface in Industry-Standard LM75 Form Factor and Pinout
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

TMP175 Fiches technique(HTML) 9 Page - Texas Instruments

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TMP175-Q1, TMP75-Q1
www.ti.com
SBOS759 – NOVEMBER 2015
7.3 Feature Description
7.3.1 Digital Temperature Output
The digital output from each temperature measurement conversion is stored in the read-only Temperature
register. The Temperature register of the TMP175-Q1 or TMP75-Q1 is a 12-bit, read-only register that stores the
output of the most recent conversion. Two bytes must be read to obtain data and are listed in Table 6 and
Table 7. The first 12 bits are used to indicate temperature with all remaining bits equal to zero. The data format
for temperature is listed in Table 1. Negative numbers are represented in binary twos complement format.
Following power-up or reset, the Temperature register reads 0°C until the first conversion is complete.
The user can obtain 9, 10, 11, or 12 bits of resolution by addressing the Configuration register and setting the
resolution bits accordingly. For 9-, 10-, or 11-bit resolution, the most significant bits (MSBs) in the Temperature
register are used with the unused least significant bits (LSBs) set to zero.
Table 1. Temperature Data Format
DIGITAL OUTPUT
TEMPERATURE
(°C)
BINARY
HEX
128
0111 1111 1111
7FF
127.9375
0111 1111 1111
7FF
100
0110 0100 0000
640
80
0101 0000 0000
500
75
0100 1011 0000
4B0
50
0011 0010 0000
320
25
0001 1001 0000
190
0.25
0000 0000 0100
004
0
0000 0000 0000
000
–0.25
1111 1111 1100
FFC
–25
1110 0111 0000
E70
–55
1100 1001 0000
C90
7.3.2 Serial Interface
The TMP175-Q1 and TMP75-Q1 operate only as slave devices on the SMBus, two-wire, and I2C interface-
compatible bus. Connections to the bus are made through the open-drain I/O lines SDA and SCL. The SDA and
SCL pins feature integrated spike-suppression filters and Schmitt triggers to minimize the effects of input spikes
and bus noise. The TMP175-Q1 and TMP75-Q1 support the transmission protocol for fast (up to 400 kHz) and
high-speed (up to 2.38-MHz) modes. All data bytes are transmitted MSB first.
7.3.2.1 Bus Overview
The device that initiates the transfer is called a master, and the devices controlled by the master are slaves. The
bus must be controlled by a master device that generates the serial clock (SCL), controls the bus access, and
generates the START and STOP conditions.
To address a specific device a START condition is initiated, indicated by pulling the data line (SDA) from a high
to a low logic level when SCL is high. All slaves on the bus shift in the slave address byte, with the last bit
indicating whether a read or write operation is intended. During the ninth clock pulse, the slave being addressed
responds to the master by generating an Acknowledge bit and pulling SDA low.
Data transfer is then initiated and sent over eight clock pulses followed by an Acknowledge bit. During data
transfer, SDA must remain stable when SCL is high because any change in SDA when SCL is high is interpreted
as a control signal.
When all data are transferred, the master generates a STOP condition indicated by pulling SDA from low to high
when SCL is high.
Copyright © 2015, Texas Instruments Incorporated
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Product Folder Links: TMP175-Q1 TMP75-Q1


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